[lld] [lld-macho][LTO] Emit `__llvm_addrsig` for `--icf=safe_thunks` (PR #188486)

[Zhaoxuan Jiang via llvm-commits]

nocchijiang wrote:

Thanks, really appreciate you working on this. I was digging into the same issue on my side and ended up with pretty much the same fix, so it is nice to see we landed in the same place.

https://github.com/llvm/llvm-project/pull/188486